Hi friend, don't worry and be reassured, everyone makes mistakes (mistakes are human)
if I understand correctly,
you have a solution of aqua regia in which you attacked an alloy that contained gold
right ?
2) you dissolved all your alloy in aqua regia and then you introduced copper (metal) so that the gold cements on it exactly?
3) you have solved the problem by adding too much hno3 (nitric acid) and so it attacked the copper and your gold did not precipitate correctly ?
4) between panic, rage and lack of knowledge you wanted to remove the excess of nitric acid a little hastily by adding bicarbonate of soda (because it is alkaline), telling yourself that it would neutralize the correct acidity?
5) You are angry and frustrated not to have the desired result and you are afraid to be badly judged here on the forum ?
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joekbit gives you the beginning of a possibility
if I were you this is what I would do:
1) take pictures because it will help us to understand the situation
2) filter the solution and separate the solid from the liquid
3) do a test with the stanous chloride to see if you still have gold in solution
4) rinse the solids with distilled water several times, the sodium bicarbonate should dissolve and you will be able to filter it out, and the gold will remain in your filter
5) melt your gold, and if you want, you can purify it a second time
for your remaining solution of departure if you still have gold, you can heat in a beaker 80°c allows to denature the nitric acid and to make him lose of its power, add then some urea which will be able to denox it completely,
6) add some SMB sodium metabisulfite to recover the gold from your mother solution
7) melt the rest of your gold
If I am wrong and all your gold has precipitated (cemented) and is in contact with the sodium bicarbonate, you just have to add water and heat it, so the water will dissolve the bicarbonate
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see you
